Question

Помогите решить 3 задачи 1.имеется соль массой 150г. Рассчитайте массу воды, которую необходимо взять, чтобы получить раствор с массовой долей вещества 12%2.При упариваний 400г раствора соли с массовой долей 2% был получен раствор новый раствор массой 240. Какова массовая доля соли в полученном растворе?3.Сколько воды необходимо чтобы получить раствор с массовой долей вещества 15% если масса вещества составляет 12г

Answer 1

Объяснение:

примерно как-то так это все решается

Answer 2

Problem 1: Calculation of Water Mass for a Solution with a Given Mass Fraction of Substance

To calculate the mass of water needed to obtain a solution with a mass fraction of 12% of the substance, we can use the following formula:

Mass of water = (Mass of substance / Desired mass fraction) - Mass of substance

Given: - Mass of substance (salt) = 150g - Desired mass fraction = 12%

Let's substitute the values into the formula:

Mass of water = (150g / 0.12) - 150g

To find the solution, we need to calculate the mass of water.

Problem 2: Calculation of Mass Fraction of Salt in a Solution Obtained by Evaporation

To calculate the mass fraction of salt in the solution obtained by evaporating 400g of a solution with a mass fraction of 2% salt, we can use the following formula:

Mass fraction of salt = (Mass of salt / Total mass of solution) * 100%

Given: - Mass of the initial solution = 400g - Mass fraction of salt in the initial solution = 2% - Mass of the new solution obtained by evaporation = 240g

Let's substitute the values into the formula:

Mass fraction of salt = (Mass of salt / 240g) * 100%

To find the solution, we need to calculate the mass fraction of salt.

Problem 3: Calculation of Water Mass for a Solution with a Given Mass Fraction of Substance

To calculate the mass of water needed to obtain a solution with a mass fraction of 15% of the substance, we can use the following formula:

Mass of water = (Mass of substance / Desired mass fraction) - Mass of substance

Given: - Mass of substance = 12g - Desired mass fraction = 15%

Let's substitute the values into the formula:

Mass of water = (12g / 0.15) - 12g

To find the solution, we need to calculate the mass of water.

Now, let's calculate the solutions for each problem.